We do not suggest added fats such as low fat margarine. Low fat margarine is still high in fat but the difference is that it contains more water. Becel No Fat Butter Spray or I Can’t Believe It’s Not Butter spray toppings are a good substitute which tastes identical to butter or margarine but contains no calories (when used in moderation). It is an ideal product for popcorn, vegetables and potatoes. PAM may also be used for cooking egg whites or frying.